Code result
P2D42
A/C Compressor Motor Voltage B Low
High severity
What it means
The voltage B feedback of the electric A/C compressor motor is below the expected window. Phase wire shorted to ground or driver fault.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Phase B wire shorted to ground
highOne of the most commonly reported causes for this code — check this first.
Output driver low-side fault
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P2D42 freeNo credit card required